We produce the open strings on R×S2 that correspond to
the solutions of integrable boundary sine-Gordon theory by making use of the
N-magnon solutions provided in \cite{KPV} together with explicit moduli.
Relating the two boundary parameters in a special way we describe the
scattering of giant magnons with non-maximal Y=0 giant gravitons and
calculate the leading contribution to the associated magnon scattering phase.Comment: 34 pages, 8 figure